Complete the following statement with the most appropriate phrase.
Class switch recombination (CSR):

Question

Complete the following statement with the most appropriate phrase. 
 Class switch recombination (CSR):

Answer

alters the constant region of the heavy chain

Answer

switches from the membrane to secreted form of immunoglobulin

Answer

alters the variable region

Answer

selects for high affinity antigen B cell receptors during an immune response

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